Chosen Solution
I was using maxcom mx 620 multimeter to measure the output of a high voltage power supply (I’m an undergraduate mechanical engineering student and needed the power supply for a project). since the multimeter has a maximum of 1000 volts DC, I used two resistances in series and measured around one of them to reduce the voltage to a few hundred volts. This worked until one of the resistances some how failed, and the voltage went around it. The multimeter turned itself off. I turned the dial to the off position and back. and the screen had all the “setting indicators” displayed at the same time, and keeps giving a reading that increases until it reaches “OL”, (which is usually given when the input exceeds the maximum allowed), without the test leads actually touching anything.
I disassembled the multimeter and found that a fuse inside had blown, but after changing it, the problem persisted. Is there any way to fix it? Thanks in advance Update (07/03/2017) To my eyes, nothing is amiss. There are no burn marks, no inflated capacitors, no cracked components. Unfortunately, I have nothing to test the diodes with, as I’ve seen failed diodes that have no visible marks on their outside.
open up the multimeter check for any possible burnt electronics components inside, e.g. smd resistors, transistors, etc. it would be great if you can share some pictures of the circuit internals.
You’ve probably damaged the DAC …it could be fixed but you’d then need to calibrate it buy a new one much easier
Hm, maybe you would consider checking this post, n case you are still looking for how to check your multimeter
